Facile in situ growth of ZIF-8 films onto aluminum for applications requiring fast thermal response

Abstract

In this work, we report a simple approach for the synthesis of highly crystalline films of ZIF-8 directly grown onto non-functionalized common aluminum substrates through an easy, short in situ solvothermal methodology. Through several techniques such as XRD, SEM, EDS, AFM and XPS, it is shown that a simple, short pretreatment of the substrate with a dilute hydrochloric acid solution promotes the subsequent solvothermal nucleation and growth of continuous, homogeneous micrometer thickness and very adherent ZIF-8 films. The robustness and usefulness of ZIF-8/aluminum are shown by testing it in the highly exothermic catalytic reaction of carbon monoxide oxidation, in which it presented a high performance and durability, preserving the metal–organic framework integrity during reaction time. This behavior demonstrates that the novel ZIF-8/aluminum systems have a high potential for use in applications at moderate temperatures demanding a fast heat exchange rate between the metal–organic framework (MOF) film and the substrate.